Procter & Gamble : the house that Ivory built / by the editors of Advertising Age. - Lincolnwood, Ill.: NTC Business Books, [1988]. - 234 p. : ill., ports ; 24 cm. Includes index. ISBN: 0844231657 Subjects--Corporate Names: Procter & Gamble Company--History Subjects--Topical Terms: Soap trade--History--United States Dewey Class. No.: 338.76681